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8527 · 2021年06月01日

求题中答案第二部分给callable bond求value部分的解释

NO.PZ2018123101000086

问题如下:

Exhibit 1 shows par, spot, and one-year forward rates.

Bond 4 is a fixed-Rate Bonds of Alpha Corporation, with 1.55% annual coupon and callable at par without any lockout periods. The bond maturity is 3 years.

Based on the information above, the value of the embedded option in Bond 4 is closest to:

选项:

A.

nil.

B.

0.1906.

C.

0.3343.

解释:

C is correct.

考点:考察对含权债券的理解

解析:

债券4是可Callable。其价值为:

Value of callable bond = value of straight bond – value of call option on bond

因此,Embedded call option的价值为:

Value of call option on bond = Value of straight bond – Value of callable bond

利用Spot rate对该Straight bond进行定价为:

1.55(1.0100)1+1.55(1.012012)2+101.55(1.012515)3=100.8789\frac{1.55}{{(1.0100)}^1}+\frac{1.55}{{(1.012012)}^2}+\frac{101.55}{{(1.012515)}^3}=100.8789

而Callable bond的定价需要使用1-year forward rate,将债券的现金流从最后一期开始,依次向前一个节点折现,以判断折现值是否会触发行权价;使用表格中的Forward rate对Callable bond进行定价:

因此Call option的Value为:100.8789-100.5446=0.3343

如题所示,这到题求callable value时为什么不用第三年尾101.55 以1.3522% 这到第二年,再用得到的pv加上1.55以 1.4028%的r折到第一年底,知道0时刻 的方式求value。 不明白答案表格中为什么要每年单个求pv 而不是往前推的方式。 还有为什么第二,三年的pv大于strike px 100时 callable value就是第一年的pv? 这一点没理解,求解,谢谢
1 个答案
已采纳答案

WallE_品职答疑助手 · 2021年06月02日

嗨,爱思考的PZer你好:


这道题就是从第三年开始往前一年一年折现的呀。 第二年的value 表格里面写的 就是用第三年的本金100+coupon 1.55 然后用的是1.3522%往前折现的。call option 行权价为100,超过了100 就会被执行,所以折现的价格超不过100.


同理第一年的value 是第二年的100+coupon 1.55 然后用1.4028% 往前折现的,依次类推。callable value不取决于PV 取决于行权的价格,这一题正好pv等于行权价格等于100而已(callable at par)。

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就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

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